Stirlingengineforum.com

Hello,

please visit my "Dreisotech" youtube-channel. (http://www.youtube.com/user/dreisotech)

You will find a new Ringbom-Design and a new Paper-Stirling-engine there.

Best regards from Germany,
Holger

Very clever simple design. It uses a free floating lever as timing, is that right? The power piston is on one side of the diaphram and the displacer is on the other side.Usually the displacer travels 1.5 times the distance of the power piston.A fixed lever with the fulcrum unevenly spaced could achieve the 1.5 to 1 ratio. It could be built with a piston and no diaphragm.This would eliminate the need for a crankshaft.Just a flywheel connected to the power piston and a fixed lever connecting the displacer. Great invention.

To be a Ringbom motor the displacer is mechanically unattached to the power piston, and opperated by pressure differential, some times, if the displacer is a bit heavy, a spring may be used to assist it, I'v got three of them, all high temperature motors, part of the trick in getting them to work properly is to get the right diameter for the displacer rod, because this is the piston that opperates the displacer.
So after all that I'm not sure if your motor is a true Ringbom, I'll have to wait until I can get on to Broadband, and have a good look at your vidio, I'm on dial up at the moment,and it takes too long to load, we'll see tomorrow. Ian S C

Hi, it is a real Ringbom, the displacer is driven by the pressure difference. Imagine an engine with two membrans, if you merge the membranes, you come to my design. Observe how the halfs of the bellow work independent in the last part of the video, when the motor is working irregular.
Holger

Yes I agreewith you, now that I'v seen it. I wounder if you have maybe too much heat, the motor goes great at first, then becomes difficult. does it work equaly well in both directions, ie., left and right hand rotation. Often a Ringbom motor will self start,first it starts rocking back and forth, then it starts to rotate in one direction or he other. I made one of mine as a stove top fan, but it was too powerful, and mae too much noise. Ian S C

Hey dreisotech
Maybe your engine is 'Too well sealed', (WTF), what i mean is, that as the overall average temperature of the working gas rises, the mean volume of the sealed working gas increases, which causes your diaphragm to bloat up.
Maybe a strategically placed, tiny pinhole (in a non moving area or component), will allow the overall high and low pressure to 'equalise', relative to the 'external' atmospheric pressure (buffer zone), without reducing the overall power significantly (it only needs to be a really small hole, i would think).
Just a thought..

vamoose

It is a prototype, proof of concept. I Agree - it helps to make a snuffle-pinhole.